What____at the charity show last year?A has happened B was happened C did happen D happened

What____at the charity show last year?A has happened B was happened C did happen D happened
What____at the charity show last year?A has happened B was happened C did happen D happened

What____at the charity show last year?A has happened B was happened C did happen D happened
D
last year 去年,用一般过去时,排除A,而HAPPEN 是不及物动词没有被动语态,再排除B,WHAT 作主语,再排除C
加油!不明白再问!